openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

media: imx: prpencvf: enable double write reduction 

For the write channels with 4:2:0 subsampled YUV formats, avoid chroma
overdraw by only writing chroma for even lines. Reduces necessary write
memory bandwidth by at least 25% (more with rotation enabled).

Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Steve Longerbeam 2017-07-22 17:21:41 -04:00 committed by Mauro Carvalho Chehab
parent 4560cb4a0c
commit b54a5c2dc8
1 changed files with 11 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/staging/media/imx/imx-ic-prpencvf.c
View File

@ -374,6 +374,17 @@ static int prp_setup_channel(struct prp_priv *priv,
image.phys0 = addr0;
image.phys1 = addr1;
if (channel == priv->out_ch || channel == priv->rot_out_ch) {
switch (image.pix.pixelformat) {
case V4L2_PIX_FMT_YUV420:
case V4L2_PIX_FMT_YVU420:
case V4L2_PIX_FMT_NV12:
/* Skip writing U and V components to odd rows */
ipu_cpmem_skip_odd_chroma_rows(channel);
break;
}
}
ret = ipu_cpmem_set_image(channel, &image);
if (ret)
return ret;